C1 and C2 are in series, so their equivalent capacitance is:
$$C_{12} = \frac{C_1 \cdot C_2}{C_1 + C_2} = \frac{3 \cdot 5}{3 + 5} = 1.875 \text{ MF}$$
C12 and C3 are in parallel, so their equivalent capacitance is:
$$C_{123} = C_{12} + C_3 = 1.875 + 0.5 = 2.375
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